Attention is drawn to the fact that the derivation of so-called ‘Thermodynamic Temperatures’ by the addition of the quantity, 273·15, to temperatures referred to the IPTS leads to discrepancies in the values of the thermodynamic properties calculated from equations of state by means of the thermodynamic relations. These differences are shown to be significant when compared with the tolerances in the 1963 International Skeleton Tables and a simple method of avoiding this error is described.
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